It clips very nicely to the shelf I installed above the bed on the upper bed rail. I believe you gave me the dimensions of the one you had fitted by Danbury. I found it works very well. It does not have any thermostatic control but when I use it its so hot the temperature wouldn't drop low enough to switch it off. I do however have a 13 amp socket with thermostat control that I use with my heater and suppose you could utilize that.

We have a little clip on fan like the one shown in the photo. I would say 'don't over think the problem'. If you are in France in the summer on a campsite you are going to have lots of windows/doors open. We have a roof light which helps but a simple fan works fine. Our one has a pull/push switch to turn on movement. It swings through an arc to move the air better.

(We have never left the tail gate open)

________________________________________________________________________________what is best in life ?

For each of the examples shown so far, isn't what you're essentially doing it moving the warm air around the van (and just providing a breeze)?

I can't see where the cooling comes from?

P.

I needed to use T on my regular school run during the recent hot weather. There was no breeze and the kids were melting in the back so I turned on the fridge, propped the door open and placed one of our small fans in the freezer box.

We usually put the front windows down at night in France, with the screen cover on so no one can tell. I was thinking of getting a couple of those plastic guards that fit in to allow air for pets left in cars for a bit more security.